Event | Year | Start | End | Races | Teams |
---|---|---|---|---|---|
Pre-Worlds | 1981 | 01 Jan | 01 Jan | 6 | 90 |
World Championship | 1981 | 01 Jan | 01 Jan | 6 | 86 |
North American Championship | 1978 | 01 Jan | 01 Jan | ||
World Championship | 1971 | 20 Aug | 24 Aug | 6 | |
World Championship | 1963 | 01 Jan | 01 Jan |